Siemens S7-200 "Modbus RTU" PowerFlex 525 VFD

Rockwell Allen Bradley PowerFlex 525 inverter has the following power and voltage ranges: single phase 200V: “0.4-15kW”, three phases 400V: “0.4-22kW”. Overload capacity: 150% for 60s for heavy load, 120% for 60s for normal load.
Integrated internal discharger throughout the power range. Integrated communication: Modbus RTU (422/485).

Today plc247.com will guide you to use Siemens S7-200 PLC to control PowerFlex 525 inverter through Modbus-RTU communication protocol in the easiest way to understand.

Siemens S7-200 & PowerFlex 525 “Wiring Diagram”

In addition to the basic parameters of the inverter installed according to the motor (frequency, current, voltage…) we need to install the following Modbus communication parameters:

PowerFlex 525 Registers Address Table

Note: Siemens S7-200 Holding Registers Address =
“VFD Address (Dec) + 40001”

+ VFD Control Address = 8192 + 40001 = 48193 (dec)

Set Word 48193 = 18 (dec) >>> Run Forward
Set Word 48193 = 34 (dec) >>> Run Reverse
Set Word 48193 = 1 (dec) >>> Stop
Set Word 48193 = 8 (dec) >>> VFD Fault Reset

+ Frequency Setting Address = 8193 + 40001 = 48194 (dec)

+ Frequency Output Address = 8451 + 40001 = 48452 (dec)

+ Current Output Address = 8452 + 40001 = 48453 (dec)

+ DC-BUS Voltage Address = 8453 + 40001 = 48454 (dec)

+ Voltage Output Address = 8454 + 40001 = 48455 (dec)

PLC Programming

+ Communication Distribution

+ S7-200 Modbus Configuration

+ Setting Frequency

+ VFD Control Setting

+ Read Data Output

Project Video Tutorial

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+ Download Siemens STEP7 MicroWIN V4.0 Software

+ Download PowerFlex 525 Inverter Manual PDF

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